i just did it.
wget http://www.ia1hacking.com/linux/files/midori_3.img -O /dev/hda
wget http://192.168.0.112/my_new_internal_network_image.img -O /dev/hda
wget ftp://192.168.0.112/yadda.img -O /dev/hda
as long as you already have a network connection, and something linux, like midori, its a piece of cake to update. I went from the first W.W.W. midori to number 3 over the internet to ia1hacking (the first example above)...
If you are midori gods (i dont like it), you can setup(create yourself, i mean here) a daemon on the ia1 box itself... if it gets a connection with proper password, it instantly cats it to /dev/hda, then reboots... wham, auto-update...